Unit 5 - Lesson 7 - Grade 5: Illustrative Mathematics

What do you notice?

What do you wonder?

Until 1728, doubloons weighed 6.867 grams.After 1728, they weighed 6.766 grams.You have a scale that measures weight to thenearest tenth of a gram. Was the doubloon on the scale made before or after 1728?

If you had a scale that measured to the nearest gram, explain why you would not be able to tell what year the doubloon was made based on the weight listed on the scale.

Which doubloons weigh more, the ones made before 1728 or the ones made after 1728? Explain or show your reasoning.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.There are 14 pencils on the desk.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.The population of Los Angeles is 12,400,000.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.It's 2.4 miles from the school to the park.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.The runner finished the race in 19.78 seconds.

A one-dollar gold coin weighs 1.672 grams.A scale reads to the nearest tenth of a gram. What will the scale give for the weight ofthis coin?